19-2631; Rev 2; 2/10
IT
TION K
VALUA
E
BLE
AVAILA
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
General Description
Features
o
Programmable Current Limit (1A to 4A) with
Resistor
o
Autoreset Feature Saves System Power
o
20ms Fault-Blanking Circuitry
o
Active-High/Low Control Logic
o
Fault-Indicator Output
o
Thermal-Overload Protection
o
Smaller 4mm x 4mm Thin QFN Package (MAX1563)
o
3µA Shutdown Current
MAX1562/MAX1562H/MAX1563
The MAX1562/MAX1562H/MAX1563 single current-
limited switches provide up to 4A to power up to eight
USB ports. They operate from a 4V to 5.5V input
supply and consume only 40µA of quiescent current
when operating and only 3µA in shutdown.
The MAX1562/MAX1562H/MAX1563s’ autoreset feature
latches the switch off if the output is shorted, thereby
saving system power. When the short is removed, the
switch is reactivated. A fault-blanking feature enables the
circuit to ignore momentary faults, such as those caused
when hot swapping a capacitive load, preventing false
alarms to the host system. Fault blanking also prevents
fault signals from being issued when the device powers
up the load.
The MAX1562/MAX1562H/MAX1563 provide several
safety features to protect the USB port. Built-in thermal-
overload protection turns off the switch when the die
temperature exceeds +160°C. Accurate internal cur-
rent-limiting circuitry protects the input supply against
both overload and short-circuit conditions. An open-
drain fault signal (FAULT) notifies the microprocessor
when a thermal-overload, current-limit, undervoltage
lockout (UVLO), or short-circuit fault occurs.
The MAX1562 has an active-low
ON,
and the
MAX1562H has an active-high ON enable input. The
MAX1563 has a selectable active-high or active-low
logic-controlled enable. The current limit is pro-
grammed from 1A to 4A using a resistor.
The MAX1562/MAX1562H are available in 8-pin SO
packages and are pin-compatible upgrades to the
MIC2545A/MIC2549A. The MAX1563 provides the
same features and higher current performance in a
smaller 12-pin (4mm x 4mm) Thin QFN package. These
devices operate over an extended temperature range
(-40°C to +85°C). An evaluation kit is available to speed
designs.
Ordering Information
PART
MAX1562ESA+
MAX1562HESA+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 SO
MAX1563ETC+
-40°C to +85°C
12 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Typical Operating Circuit
IN
INPUT
4V TO 5.5V
FAULT
IN
Applications
Notebook Computers
Desktop Computers
USB Ports and Hubs
PDAs and Palmtop Computers
Docking Stations
MAX1562
MAX1562H
MAX1563
ON
ACTIVE-HIGH/ACTIVE-LOW
SELECTABLE
SEL
MAX1563
ONLY
OUT
USB
PORT
ISET
GND
OUT
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
MAX1562/MAX1562H/MAX1563
ABSOLUTE MAXIMUM RATINGS
IN, ON,
ON,
ISET, SEL, OUT to GND .......................-0.3V to +6V
FAULT
to GND .............................................-0.3V to (V
IN
+ 0.3V)
IN to OUT..................................................................-0.3V to +6V
OUT Maximum Continuous Switch Current ............................5A
FAULT
DC Current ..............................................................10mA
Continuous Power Dissipation
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
12-Pin Thin QFN (4mm x 4mm)
(derate 16.9mW/°C above +70°C) .............................1350mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Supply Voltage Range
Switch On-Resistance
Standby Supply Current
Quiescent Supply Current
OUT Off-Leakage Current
Undervoltage-Lockout Threshold
Continuous Current-Limit Adjust
Range
I
IN
I
LKG
V
UVLO
SYMBOL
V
IN
R
ON
Switch disabled
Switch enabled, I
OUT
= 0A
Switch disabled, V
OUT
= 0V
Rising edge, 3% hysteresis
MAX1563
MAX1562/MAX1562H
R
ISET
= 4.22kΩ (MAX1563 only)
Continuous Current Limit
I
LIM
V
IN
- V
OUT
= 0.5V
R
ISET
= 5.76kΩ
R
ISET
= 8kΩ
R
ISET
= 12kΩ
R
ISET
= 4.22kΩ (MAX1563 only)
Short-Circuit Current Limit
I
LIM
V
OUT
= 0V,
R
ISET
= 5.76kΩ
I
OUT
pulsing
R
ISET
= 12kΩ
Short-Circuit Detect Threshold
Continuous Current-Limit
Blanking Timeout Period
Short-Circuit Blanking Timeout
Period
Turn-On Delay
Output Rise Time
Turn-Off Delay
t
ON
t
RISE
t
OFF
(Note 1)
From continuous current-limit condition to
FAULT
asserted
From short-circuit current-limit condition to
FAULT
asserted
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from ON to 10% of V
OUT
)
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from 10% to 90% of V
OUT
)
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from ON to 90% of V
OUT
)
10
7.5
0.5
2.5
1.2
2.9
1
1
3.2
2.4
1.7
1.1
4
3
2.1
1.4
4.9
1.6
3.6
1.4
1.7
0.4
1
20
18
1.2
2.5
0.1
3
35
35
4.0
2.3
4.7
CONDITIONS
MIN
4.0
26
3
40
0.02
3.4
TYP
MAX
5.5
50
10
80
10
3.8
4
3
4.8
3.6
2.6
1.7
A(peak)
A(RMS)
A(peak)
A(RMS)
A(peak)
A(RMS)
V
ms
ms
ms
ms
ms
A
UNITS
V
mΩ
µA
µA
µA
V
A
2
_______________________________________________________________________________________
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Output Fall Time
Thermal-Shutdown Threshold
ON,
ON,
SEL Input High Level
ON,
ON,
SEL Input Low Level
ON,
ON,
SEL Input
Leakage Current
FAULT
Output Low Voltage
FAULT
Output
High Leakage Current
OUT Autoreset Current
OUT Autoreset Threshold
OUT Autoreset Blanking Time
V
OL
I
SINK
= 1mA, V
IN
= +4V
V
IN
= V
FAULT
= +5.5V
In latched-off state, V
OUT
= 0V
In latched-off state, OUT rising
In latched-off state, V
OUT
> 0.5V
10
0.35
10
25
0.5
20
V
IH
V
IL
SYMBOL
t
FALL
CONDITIONS
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from 90% to10% of V
OUT
)
15°C hysteresis
V
IN
= +4V to +5.5V
V
IN
= +4V to +5.5V
-1
2
0.8
+1
0.4
1
45
0.65
35
MIN
TYP
0.8
+160
MAX
UNITS
ms
°C
V
V
µA
V
µA
mA
V
ms
MAX1562/MAX1562H/MAX1563
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
Supply Voltage Range
Switch On-Resistance
Standby Supply Current
Quiescent Supply Current
OUT Off-Leakage Current
UVLO Threshold
Continuous Current-Limit Adjust
Range
I
IN
I
LKG
V
UVLO
SYMBOL
V
IN
R
ON
Switch disabled
Switch enabled, I
OUT
= 0A
Switch disabled, V
OUT
= 0V
Rising edge, 3% hysteresis
MAX1563
MAX1562/MAX1562H
R
ISET
= 4.22kΩ (MAX1563 only)
Continuous Current Limit
I
LIM
V
IN
- V
OUT
= 0.5V
R
ISET
= 5.76kΩ
R
ISET
= 8kΩ
R
ISET
= 12kΩ
Short-Circuit Current Limit
Continuous Current-Limit
Blanking Timeout Period
Short-Circuit Blanking Timeout
Period
I
LIM
V
OUT
= 0V, R
ISET
= 5.76kΩ
I
OUT
pulsing R
ISET
= 12kΩ
From continuous current-limit condition to
FAULT
asserted
From short-circuit current-limit condition to
FAULT
asserted
2.9
1
1
3.1
2.3
1.6
1.0
2.4
1.1
10
7.5
CONDITIONS
MIN
4.0
TYP
MAX
5.5
50
10
80
10
3.8
4
3
4.9
3.7
2.7
1.8
4.8
2.4
35
35
A(peak)
ms
ms
A
UNITS
V
mΩ
µA
µA
µA
V
A
_______________________________________________________________________________________
3
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
MAX1562/MAX1562H/MAX1563
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 2)
PARAMETER
Turn-On Delay
Turn-Off Delay
ON,
ON,
SEL Input High Level
ON,
ON,
SEL Input Low Level
ON,
ON,
SEL Input
Leakage Current
FAULT
Output Low Voltage
FAULT
Output
High Leakage Current
OUT Autoreset Current
OUT Autoreset Threshold
OUT Autoreset Blanking Time
V
OL
I
SINK
= 1mA, V
IN
= +4V
V
IN
= V
FAULT
= +5.5V
In latched-off state, V
OUT
= 0V
In latched-off state, OUT rising
In latched-off state, V
OUT
> 0.5V
10
0.35
10
SYMBOL
t
ON
t
OFF
V
IH
V
IL
CONDITIONS
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from ON to 10% of V
OUT
)
R
OUT
= 2Ω, C
OUT
= 4.7µF
(from ON to 90% of V
OUT
)
V
IN
= +4V to +5.5V
V
IN
= +4V to +5.5V
-1
2
0.8
+1
0.4
1
45
0.65
35
MIN
0.5
TYP
MAX
4.0
3
UNITS
ms
ms
V
V
µA
V
µA
mA
V
ms
Note 1:
Short-circuit detect threshold is the output voltage at which the device transitions from short-circuit current limit to continuous
current limit.
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1562 toc01
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
SWITCH-OFF LEAKAGE CURRENT (nA)
V
ON
= 5V
3.0
SHUTDOWN CURRENT (µA)
2.5
2.0
1.5
1.0
0.5
0
TEMP = +25°C
TEMP = +85°C
TEMP = -40°C
MAX1562 toc02
SWITCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
MAX1562 toc03
50
45
40
SUPPLY CURRENT (µA)
35
30
25
20
15
10
5
0
3.0
3.5
4.0
4.5
5.0
TEMP = +85°C
TEMP = -40°C
TEMP = +25°C
3.5
1000
100
10
1
0.1
0.01
0.001
5.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
Typical Operating Characteristics (continued)
(V
IN
= +5V, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
MAX1562/MAX1562H/MAX1563
NORMALIZED R
ON
vs. TEMPERATURE
MAX1562 toc04
NORMALIZED CONTINUOUS
CURRENT LIMIT vs. TEMPERATURE
MAX1562 toc05
TURN-ON TIME vs. TEMPERATURE
R
LOAD
= 2Ω
MAX1562 toc06
1.3
1.2
NORMALIZED R
ON
1.1
1.0
0.9
0.8
0.7
-40
-15
10
35
60
1.03
NORMALIZED CONTINUOUS CURRENT LIMIT
1.02
1.01
1.00
0.99
0.98
0.97
0.96
3.0
2.5
TURN-ON TIME (ms)
2.0
1.5
1.0
0.5
0
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
TURN-OFF TIME vs. TEMPERATURE
(t
OFF
+ t
FALL
)
MAX1562 toc07
FAULT-BLANKING TIME
vs. TEMPERATURE
MAX1562 toc08
AUTORESET CURRENT
vs. TEMPERATURE
MAX1562 toc09
3.0
R
LOAD
= 2Ω
2.5
TURN-OFF TIME (ms)
2.0
1.5
1.0
0.5
0
-40
-15
10
35
60
22.0
21.8
FAULT-BLANKING TIME (ms)
21.6
21.4
21.2
21.0
20.8
20.6
20.4
20.2
20.0
40
AUTORESET CURRENT (mA)
-40
-15
10
35
60
85
30
20
10
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
85
TEMPERATURE (°C)
AUTORESET CURRENT vs. V
CC
MAX1562 toc10
OVERLOAD RESPONSE INTO 1.4
Ω
V
IN
SHORT-CIRCUIT RESPONSE INTO 0
Ω
5V/div
V
IN
40
35
AUTORESET CURRENT (mA)
30
25
20
15
MAX1562 toc11
MAX1562 toc12
5V/div
V
OUT
V
OUT
5V/div
V
FAULT
FAULT
5V/div
I
OUT
I
OUT
5V/div
5V/div
10
5
0
4.0
4.3
4.6
4.9
5.2
5.5
20ms/div
V
CC
(V)
10A/div
TIME (10ms/div)
2A/div
_______________________________________________________________________________________
5
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